I mean, in the previous version of storymaps I could modify esri.arcgis.utils.createMap mapOptions (index.html) and simply add
extent: new esri.geometry.Extent({xmin:360000,ymin:6343000,xmax:730000,ymax:6657000,spatialReference:{wkid:3301}})
... to support EPSG:3301 SRS.
Now I cant find the place to do that.
Raivo